Supplemental Financial Statement Information - Shipping and Handling (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	$ 114,543	$ 110,331
Depreciation and amortization expense	19,219	18,992
Operating expense - equipment lease expense	8,388
Equipment lease expense, Topic 840		7,863
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	114,543	110,331
Depreciation and amortization expense	19,219	18,992
Operating expense - equipment lease expense	8,388
Equipment lease expense, Topic 840		7,863
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	48,015	47,443
Depreciation and amortization expense	1,840	1,072
Equipment lease expense, Topic 840	7,642	7,519
Costs and Expenses, Total	57,497	56,034
Shipping and Handling [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense - personnel, vehicle, plant and other	48,015	47,443
Depreciation and amortization expense	1,840	1,072
Equipment lease expense, Topic 840	7,642	7,519
Costs and Expenses, Total	$ 57,497	$ 56,034